OGame - OGame is an addictive, Massively Multiplayer Online, Real-time Strategy, Space-war, and Money Management Browser-based video game develop by Gameforge AG.
Cloneuniverse - You start with your first planet in a big galaxy and expand your empire with more and more planets. At the same time you have to defend yourself against other players, form alliances. All around a nice game and what is most important. No Pay to Win
EVE Online - Player-created empires, player-driven markets, and endless ways to embark on your personal sci-fi adventure.
Entropia Universe - Entropia Universe is an Addictive game for those players who love playing MMOFPS games.
Galaxy on Fire - Galaxy on Fire is a space combat and trading simulation.
Shores of Hazeron - Unscripted, living and thriving universe.